US5133538A - Table for securing a pallet supporting a workpiece to machine tools - Google Patents
Table for securing a pallet supporting a workpiece to machine tools Download PDFInfo
- Publication number
- US5133538A US5133538A US07/397,129 US39712989A US5133538A US 5133538 A US5133538 A US 5133538A US 39712989 A US39712989 A US 39712989A US 5133538 A US5133538 A US 5133538A
- Authority
- US
- United States
- Prior art keywords
- spindle
- clamp arms
- clamp
- spring
- pallet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/18—Chucks with simultaneously-acting jaws, whether or not also individually adjustable pivotally movable in planes containing the axis of the chuck
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/0063—Connecting non-slidable parts of machine tools to each other
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
- Y10T29/5196—Multiple station with conveyor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/30868—Work support
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/14—Rotary member or shaft indexing, e.g., tool or work turret
- Y10T74/1476—Rotary member or shaft indexing, e.g., tool or work turret with means to axially shift shaft
Definitions
- the present invention relates generally to a table for use in association with machine tools, and, more particularly, to a table for releasably securing an automatic pallet supporting a workpiece to the machine tools.
- Tables of the aforementioned type have been proposed wherein a pallet is clamped under a hydraulic pressure; however, the use of hydraulic pressure requires a hydraulic system and its attendant disadvantages. More particularly, by virture of the use of a hydraulic system, the overall size of the machine is increased. Moreover, if a larger or greater force acts on the pallet which exceeds the hydraulic clamping force, the pallet is likely to "float" or move.
- an object of the present invention is to provide a table for securing a pallet supporting a workpiece to the machine tool.
- a table for securing a pallet supporting workpieces to machine tools comprising a spindle movable up and down, a driving means for moving the spindle in a vertical direction, the spindle comprising a plurality of clamp arms arranged radially thereof, means for operating the clamp arms, each arm including a clamp pawl movable radially of the spindle, connecting members freely connected to the clamp arms at one ends and to the arm operating means at the other ends, whereby the ascent of the spindle enables the clamp arms to move outward by a force given by the ascending spindle through the connecting members and enabling the clamp pawl to position at a place where the pallet is clamped, and become locked to the place by the connecting members, and whereby the descent of the spindle enables the clamp arms to withdraw to their original positions.
- FIG. 1 is a cross-sectional front view showing a table according to the present invention, wherein a pallet is clamped by the table;
- FIG. 2 is a cross-sectional front view showing a table of FIG. 1, wherein the clamping pressure released;
- FIG. 3 is a cross-sectional front view showing a table in its unclamping state
- FIG. 4 is a cross-sectional view taken along 4--4 line in FIG. 1;
- FIG. 5 is a cross-sectional view taken along 5--5 line in FIG. 4;
- FIG. 6 is a perspective view showing a pallet clamping ring
- FIG. 7 is a perspective view showing a sector-shaped member
- FIG. 8 is a perspective view showing an unclamping pin
- FIG. 9 is a perspective view showing an arm pressing block
- FIG. 10 is a perspective view showing a clamping arm
- FIG. 11 is a perspective view showing a connecting member.
- a table 1 is placed on a bed of a machine such as, for example, a machining center, so as to be movable along guide rails 2 in a direction perpendicular to a plane of the drawings.
- the table 1 includes a space 3 to accommodate a clamp portion of a pallet (P).
- the space 3 includes a lower opening 4 lined with a cylindrical wall member 6 by bolts 7, and surrounded with a bottom plate 8 by bolts 9.
- a hydraulic chamber 10 is formed between the wall member 6 and the bottom 8. The hydraulic chamber 10 is supplied with oil through a path 11.
- the space 3 is also provided with an index coupling 12 on its inside wall, and a vertically movable coupling 13 is disposed in such a manner as to be engageable with the stationary index coupling 12.
- the movable coupling 13 is moved by a driving means (not shown) disposed near an upper opening 5 of the table 1.
- a pallet base 15 is provided with a supporting block 16 in its lower section and a flange 17 in its upper section to support a clamping arm described below.
- the flange 17 is provided with couplings 18 erected in a circle on its top surface toward the pallet (P).
- a cover 19 is provided for covering the upper opening 5 of the table 1.
- the supporting block 16 of the pallet base 15 is rotatable around the axis of the table 1 through bearings 20, and an index coupling 21 is fixed to the supporting block 16.
- a movable coupling 13 is engaged with the index coupling 21 and the coupling 12 of the table 1, thereby enabling the pallet base 15 to be fast at a desired indexed position.
- a hydraulic cylinder 22 includes flange portion 23 fixed to the bottom of the pallet base 15 by bolts, and a lower end extending through the bottom plate 8 of the table 1 until its lower periphery contacts the inside wall of the bottom plate 8 through a seal ring 24.
- the hydraulic cylinder 22 includes a ring-shaped step 25, and a hydraulic chamber 27 between the ring-shaped step 25 and a bottom member 26, with the hydraulic chamber 27 being supplied with oil through paths 28 and 29.
- the hydraulic cylinder 22 includes long holes 30 in its upper section, with the holes 30 being diametrically opposed to each other and axially extending.
- a spindle which 31 is movably inserted in the hydraulic cylinder 22 in contact with the inside wall of the ring-shaped step 25.
- the spindle 31 is fitted with another spindle 32 which moves in the hydraulic chamber 27.
- the spindle 31 is provided with a pair of blocks 33, 34 through springs 35.
- the structure and function of the blocks 33, 34 will be described below:
- the spindle 31 includes a bore 36 in which a spring 37 is inserted to urge the spindle 31 upward.
- the spring 37 is supported by the bottom plate 26.
- a cylindrical piston 40 is fitted around a lower part of the hydraulic cylinder 22 so as to release the clamping pressure.
- the piston 40 includes a piston portion 41 in its lower section, and a ring-shaped shoulder 42.
- the piston portion 41 moves in the hydraulic chamber 10.
- the piston 40 is normally biased upward by a spring 43 disposed between the piston portion 41 and the bottom plate 8.
- a pallet clamping ring 50 of a cylindrical form is fitted around an upper part of the cylinder 22 above its flange portion 23.
- the clamping ring 50 as shown in FIG. 6, includes four slots 51 cut downward from its rim, the four slots 51 being spaced by an angular interval of 90°, and four T-shaped grooves 52 which are also spaced by an angular interval of 90°.
- the T-shaped grooves 52 are arranged to position between one slot and the next.
- a pair of holes 53 are diametrically located, below the adjacent slot 51 for allowing pins 61 to pass therethrough.
- each wall component 54 is provided with a sector-shaped member 55 shown in FIG. 7 fixed by means of bolts 56, as shown in FIGS. 4 and 5.
- Each sector-shaped member 55 includes holes 58 for allowing guide post 59 to pass therethrough and threaded holes 57 for receiving fastening bolts 56.
- the clamping ring 50 equipped with the sector-shaped members 55 is slidably fitted around the hydraulic cylinder 22. As best shown in FIG. 5, spring guide bars 59 erected on the bottom of the pallet base 15 are passed through the holes 58. The clamping rind 50 is biased upward by a spring 60 fixed to the spring guide bar 59.
- the pins 61 are passed through the holes 53 such that the top portions 62 thereof are protruded inside the clamping ring 50 and fit in the long hole 30 of the hydraulic cylinder 22. In this way the clamping ring 50 is allowed to move vertically within the range limited by the long holes 30.
- An unclamping pin 63 is fixed to a lower part of the clamping ring 50. As shown in FIG. 8, the unclamping pin 63 includes a head 65, a neck 64 and a leg 66. The unclamping pin 63 is fixed to the clamping ring 50 by inserting the head 65 and the neck 64 in the T-shaped grooves 52 (FIG. 6). Each clamping pin 63 passes through a hole 67 and extrudes downward until its leg 66 engages the ring-shaped shoulder 42 of the piston 40.
- a movable engager 70 includes pawls 71 and 72 at opposite ends and a pivotal dowel 73 at its center.
- the dowel 73 fits in a recess 74 in the top portion 62 of the pin 61 so that the engager 70 oscillates about the dowel 73.
- the blocks 33, 34 are shaped in the form of eight-sided figure as shown in FIG. 9, and respectively include horn members 78 and 79 diametrically arranged. Each horn member 78, 79 includes a semi-circular recess 77. Though the two blocks 33 and 34 take the similar form, they are different in their fixing position with respect to the respective body portions such that when the blocks 33 and 34 are joined face to face, they are in the same plane with the horn members 78 and 79 being angularly space by 90°.
- the facially joined blocks 33, 34 are fixed on the top end of the spindle 31 through the spring 35.
- the blocks 33 and 34 are maintained by bolts 81 through a presser plate 80 in such a manner as to be movable under the action of the spring 35.
- the movability of the blocks 33, 34 equalizes the clamping pressure by a plurality of clamp arm 85, which will be hereinafter described in greater detail. It is arranged that the pressure of the spring 35 is smaller than that of the spring 60 which urges the clamping ring 50 upward.
- a substantially J-shaped clamp arm 85 includes a hook-like clamping pawl 86, an engaging recess 87 at the back of the pawl 86, and an engager 88.
- the clamp arms 85 are accommodated in a ring-shaped recess 89 formed between the pallet base 15 and the clamping ring 50, and located at places corresponding to the horn members 78 and 79. Each clamp arm 85 is supported by the sector-shaped members 55 at both sides and its engager 88 is held toward the engagement with the flange 17.
- Each clamp arm 85 and the horn member 78 or 79 are connected by a connecting member 90 which includes projections 91 and 92 having a semi-circular cross-section at both ends.
- the projection 91 is engaged with the recess 87 of the clamp arm 85
- the other projection 92 is engaged with the recess 77 of the horn member 78 or 79.
- the clamp arms 85 are rotatably connected to the blocks 33, 34 through the connecting members 90.
- the connecting member 90 prevents the clamp arms 85 from moving to the unclamping position, and locks the clamp arms 85 to the clamping positions.
- the clamp unit is covered by a cover 93 which is supported by a pin 94 vertically movable, and wholly covers the pallet base 15 in the unclamping condition.
- the pallet (P) is fastened by a fastening ring 95 which is fixed to the bottom plate of the pallet (P) by bolts 96 and is provided with couplings 97 engageable with the couplings 18 of the pallet base 15.
- the fastening ring 95 is also provided with a ring-shaped step 98.
- the table is operated as follows:
- the pallet (P), placed on the pallet base 15, is prevented from turning because of its coupling 97 being engaged with the coupling 18.
- the pallet (P) is clamped by the pawls 86 of the clamp arms 85 which are engaged with the step 98.
- the clamp arms 85 are maintained by the connecting members 90 which are biased upward by the springs 37 and 60.
- Oil is introduced into the hydraulic chamber 10 through the path 11 from a source (not shown), whereby the piston 40 is forced downward for the spring 43.
- the unclamping pin 63 and the pallet clamp ring 50 are caused to descend against the spring 60.
- the descent of the clamp ring 50 causes the movable engagers 70 to descend through the pin 60, thereby releasing the lower pawl 71 from the step 75 of the spindle 31, and bringing the upper pawl 72 into abutment with an upper slant part of the cylinder 22.
- the upper pawl 72 is displaced inward whereas the lower pawl 71 is displaced outward and accommodated in the recess 76.
- the cover 93 closes the opening of the pallet base 15.
- the cover 93 and the covering plate 19 prevent cutting chips and used oil from intruding into the inside of the table 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Machine Tool Positioning Apparatuses (AREA)
- Feeding Of Workpieces (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63-209170 | 1988-08-23 | ||
JP63209170A JP2906058B2 (ja) | 1988-08-23 | 1988-08-23 | 工作機械のテーブル装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
US5133538A true US5133538A (en) | 1992-07-28 |
Family
ID=16568491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/397,129 Expired - Lifetime US5133538A (en) | 1988-08-23 | 1989-08-22 | Table for securing a pallet supporting a workpiece to machine tools |
Country Status (4)
Country | Link |
---|---|
US (1) | US5133538A (de) |
EP (1) | EP0356217B1 (de) |
JP (1) | JP2906058B2 (de) |
DE (1) | DE68916336T2 (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5189774A (en) * | 1991-07-04 | 1993-03-02 | Maho Aktiengesellschaft | Automatic pallet switching mechanism |
US5904348A (en) * | 1997-06-03 | 1999-05-18 | Chrysler Corporation | Body-locking holddown device |
US20040040413A1 (en) * | 2000-12-09 | 2004-03-04 | Albert Gunter | Rotary indexing machine for use in a group of treatment stations |
US20100199804A1 (en) * | 2007-10-10 | 2010-08-12 | Tsudakoma Kogyo Kabushiki Kaisha | Rotary index device in machine tool |
US20110100160A1 (en) * | 2009-11-05 | 2011-05-05 | Colonial Tool Group Inc. | Rotary Workpiece Indexing Method and Apparatus |
US20170144240A1 (en) * | 2015-11-25 | 2017-05-25 | Fanuc Corporation | Rotation table |
CN109551199A (zh) * | 2019-01-15 | 2019-04-02 | 苏州天准科技股份有限公司 | 一种伺服压装浮动自锁支撑机构 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4136796C2 (de) * | 1991-11-08 | 1994-03-03 | Georg Fellner | Schnellspannvorrichtung für Werkzeuge von Warmschmiedepressen |
DE4314629C2 (de) * | 1993-05-04 | 1995-10-19 | Erowa Ag | Vorrichtung zum positionsdefinierten Aufspannen eines Werkstücks am Arbeitsplatz einer Bearbeitungsmaschine |
JP2756644B2 (ja) * | 1994-05-26 | 1998-05-25 | ソーコー株式会社 | 人工芝競技場の施工方法 |
DE19716797A1 (de) * | 1997-04-22 | 1998-11-05 | Emil Stark | Lagerichtige Ein-Nippel-Einspannung |
DE19806961A1 (de) * | 1998-02-19 | 1999-08-26 | Emil Stark | Schnellspannzylinder zum Einziehen und Zentrieren eines Einzugsnippels |
CN103302514B (zh) * | 2013-05-21 | 2015-11-04 | 太仓市天合新材料科技有限公司 | 一种弹性线材自动夹具 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2672675A (en) * | 1950-02-04 | 1954-03-23 | Ralph E Cross | Locating and clamping mechanism |
US2955347A (en) * | 1956-07-09 | 1960-10-11 | Buhr Machine Tool Company | Pallet clamp construction |
US3667305A (en) * | 1969-06-21 | 1972-06-06 | Olivetti & Co Spa | Machine tool having a rotary worktable |
US4015487A (en) * | 1976-02-23 | 1977-04-05 | Cincinnati Milacron, Inc. | Index mechanism |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3082015A (en) * | 1961-11-28 | 1963-03-19 | Woodworth Co N A | Equalizing chuck |
US4032163A (en) * | 1976-01-26 | 1977-06-28 | Holt Donald G | Quick change in-motion tool chuck |
DD145236A1 (de) * | 1979-08-03 | 1980-12-03 | Horst Geissler | Vorrichtung zum wechseln von modellplatten |
JPS5851835U (ja) * | 1981-10-05 | 1983-04-08 | 相生精機株式会社 | 加工機械のクランパ− |
SE440618B (sv) * | 1983-04-12 | 1985-08-12 | Schedwin Sven Erik | Fastspenningsanordning, i synnerhet for fastspenning av arbetsbord, fixturer eller liknande pa ett underlag, sasom maskinbordet i en bearbetningsmaskin |
US4575062A (en) * | 1984-09-05 | 1986-03-11 | American Machine & Science, Inc. | Coupling construction and clamp therefor |
US4662043A (en) * | 1985-01-10 | 1987-05-05 | Sheffer Collet Company | Project plate system |
DD250828A3 (de) * | 1985-07-31 | 1987-10-28 | Werkzeugmasch Forschzent | Befestigungsvorrichtung an einer werkzeugmaschine |
SE466090B (sv) * | 1987-05-07 | 1991-12-16 | 3R Syst Int Ab | Anordning foer loesbar och repeterbar fastspaenning av tvaa foeremaal vid varandra |
-
1988
- 1988-08-23 JP JP63209170A patent/JP2906058B2/ja not_active Expired - Fee Related
-
1989
- 1989-08-22 US US07/397,129 patent/US5133538A/en not_active Expired - Lifetime
- 1989-08-23 DE DE68916336T patent/DE68916336T2/de not_active Expired - Fee Related
- 1989-08-23 EP EP89308539A patent/EP0356217B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2672675A (en) * | 1950-02-04 | 1954-03-23 | Ralph E Cross | Locating and clamping mechanism |
US2955347A (en) * | 1956-07-09 | 1960-10-11 | Buhr Machine Tool Company | Pallet clamp construction |
US3667305A (en) * | 1969-06-21 | 1972-06-06 | Olivetti & Co Spa | Machine tool having a rotary worktable |
US4015487A (en) * | 1976-02-23 | 1977-04-05 | Cincinnati Milacron, Inc. | Index mechanism |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5189774A (en) * | 1991-07-04 | 1993-03-02 | Maho Aktiengesellschaft | Automatic pallet switching mechanism |
US5904348A (en) * | 1997-06-03 | 1999-05-18 | Chrysler Corporation | Body-locking holddown device |
US20040040413A1 (en) * | 2000-12-09 | 2004-03-04 | Albert Gunter | Rotary indexing machine for use in a group of treatment stations |
US7275460B2 (en) * | 2000-12-09 | 2007-10-02 | Wema Vogtland Gmbh | Rotary indexing machine for use in a group of treatment stations |
US20100199804A1 (en) * | 2007-10-10 | 2010-08-12 | Tsudakoma Kogyo Kabushiki Kaisha | Rotary index device in machine tool |
US20110100160A1 (en) * | 2009-11-05 | 2011-05-05 | Colonial Tool Group Inc. | Rotary Workpiece Indexing Method and Apparatus |
US8770065B2 (en) | 2009-11-05 | 2014-07-08 | Colonial Tool Group Inc. | Rotary workpiece indexing method and apparatus |
US20170144240A1 (en) * | 2015-11-25 | 2017-05-25 | Fanuc Corporation | Rotation table |
US10549370B2 (en) * | 2015-11-25 | 2020-02-04 | Fanuc Corporation | Rotation table |
CN109551199A (zh) * | 2019-01-15 | 2019-04-02 | 苏州天准科技股份有限公司 | 一种伺服压装浮动自锁支撑机构 |
CN109551199B (zh) * | 2019-01-15 | 2024-04-26 | 苏州天准科技股份有限公司 | 一种伺服压装浮动自锁支撑机构 |
Also Published As
Publication number | Publication date |
---|---|
JP2906058B2 (ja) | 1999-06-14 |
EP0356217A2 (de) | 1990-02-28 |
DE68916336D1 (de) | 1994-07-28 |
DE68916336T2 (de) | 1994-10-13 |
JPH0259242A (ja) | 1990-02-28 |
EP0356217A3 (de) | 1992-05-20 |
EP0356217B1 (de) | 1994-06-22 |
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